With the approach of spring, the best season for sowing is coming. Public Science Framework is creating an excellent platform for authors to sow the seeds of science. From December 1, 2016 to March 31, 2017, authors can enjoy 40% discount for papers submitted to all journals. The original Article Processing Charges (APCs) are 120 USD, 170 USD and 270 USD. After discount, the new APCs are 72 USD, 102 USD and 162USD, for detailed information, please visit: http://www.aiscience.org/psf/paymentinformation.html